Scientific paper

Phenology of Three Exotic Pine Bark Beetle Species (Coleoptera: Scolytidae) Colonising Pinus radiata Logs in the South-western Cape Province

Published in: South African Forestry Journal
Volume 157, issue 1, 1991 , pages: 27–31
DOI: 10.1080/00382167.1991.9629096
Author(s): G.D. Tribe,

Abstract

Orthotomicus erosus (Woll.), Hylastes angustatus (Herbst) and Hylurgus ligniperda (F.) are exotic bark beetle pests of pine plantations in South Africa. Results from weekly trapping of adult beetles over a period of five years in the south-western Cape Province showed that the different species have activity peaks at different times of the year. H. angustatus is the most consistent with 95% of the beetles trapped in September and October. The O. erosus activity peak was more variable but always occurred in the summer months (October to February) when 84% of the beetles were captured. H. ligniperda was the most variable, being found in every month of the year, although an autumn peak representing 37 % of the beetles occurred in April/May. The period of lowest beetle activity was in midwinter. The use of this information in the formulation of control measures is discussed.

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